Whenever a portion of a parcel of real property is to be taken for board purposes and the remainder is to be left in such state or condition as to be of little value to its owner, or to give rise to claims or litigation concerning severance or other damage, the board may acquire the whole parcel and may sell the excess portion or exchange it for other property suitable for board purposes.
Source:
Section 120241, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PUC§ionNum=120241..